The Thatcher's toast a third season by reopening their renovated grill, but their dreams go up in smoke. Corky is given more responsibility at the grill, specifically, cooking french fries. When they close one evening, he turns the fryers off, or so he thinkd, but in actuality, he turned the fryers up as high as they go, which was the cause of the fire. He finally tells Drew that he was the cause of the fire at the end of the episode. (thetvdb.com)